We present in Appendix  the steps in the derivation of this model according to [1]} starting with the VA theory where the term \(T\bar{T} \)  is absent in the Kähler potential and \(\tilde{\gamma }= \tilde{\zeta }=\tilde{g} -{1\over 2} =0\) . It is first added in the form \(Z_TT\bar{T}\)  and \(Z_T\)  is rescaled away afterwards.Here we do not use the \(\hat{T}\)  notation as in eq. (REF ), for simplicity. The model with the added kinetic term for the Lagrange multiplier is the starting point for the ERG approach.
